4309391 has 2 divisors, whose sum is σ = 4309392. Its totient is φ = 4309390.

The previous prime is 4309369. The next prime is 4309399. The reversal of 4309391 is 1939034.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4309391 - 2¹⁴ = 4293007 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4309399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2154695 + 2154696.

It is an arithmetic number, because the mean of its divisors is an integer number (2154696).

Almost surely, 2^4309391 is an apocalyptic number.

4309391 is a deficient number, since it is larger than the sum of its proper divisors (1).

4309391 is an equidigital number, since it uses as much as digits as its factorization.

4309391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 4309391 is about 2075.9072715321. The cubic root of 4309391 is about 162.7316270789.

The spelling of 4309391 in words is "four million, three hundred nine thousand, three hundred ninety-one".